<template>
  <!-- 详情页组件：最上方bar栏/左放返回按钮 中放四个tab栏 -->
  <div>
    <nav-bar>
      <template v-slot:left>
        <div class="back" @click="backClick">
          <img src="~assets/img/common/back.svg" alt="">
        </div>
      </template>
      <template v-slot:center>
        <div class="title">
          <div v-for="(item, index) in titles"
            :key="index"
            class="title-item"
            :class="{ active: index === currentIndex }"
            @click="titleClick(index)">
            {{ item }}
          </div>
        </div>
      </template>
    </nav-bar>
  </div>
</template>

<script>
import navBar from 'components/common/navbar/navbar'

export default {
  name: "detail_navbar",
  components: {
    navBar
  },
  data() {
    return {
      titles: ['商品', '参数', '评论', '推荐'],
      currentIndex: 0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index;
      this.$emit('titleClick', index);
    },
    backClick() {
      this.$router.back();
    }
  }
}
</script>

<style scoped>
  .title {
    display: flex;
    font-size: 14px;
  }

  .title-item {
    flex: 1;
  }

  .active {
    color: var(--color-high-text);
  }

  .back img {
    vertical-align: middle;
  }
</style>